Poor OP wanted that outcryTM but instead got people using it. If it was only white to black sure racist but everyone can do anything even make people who don't smile smile would you like one of those for you ?!
I don't think the app is inherently racist. It could be used to nefarious purposes like all things. But the results vary and most are pretty convincing without relying on caricatured stereotypical facial features aside from the off mustache for brown skin.
When I think of racist face app shit, I think k of snapchats fucking Asian filter where they give em a rice hat and slant lines for eyes.